https://developer.mozilla.org/zh-CN/docs/WebAssembly/Rust_to_wasm
# install wasm-pack
cargo install wasm-pack
# build wasm
wasm-pack build --scope rust_to_wasm
# install packages
cd site
npm install
# run server
npm run server
then, you can see an url in console, open it.
my console url is http://localhost:8080/.